A quasi-optical osci1lator with HEMTs has been studied as a high power radiation source with a high carrier to noise ratio at millimeter wavelengths. The oscillator consists of a concave mirror and a metal grooved mirror with the HEMT array. Radiation power from the HEMT array is combined coherently and spatially in the oscillator. In this paper, model experiments at the Ku-band are performed, and coherent power combining with 36 HEMTs has been succesfully observed for the fundamental TEMIM1 resonator mode at the frequency of l8GHz.
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